I've recently used my Priority Pass at the airport in Greece. I would say the level of service is simply fantastic. Not only do you have unlimited Wi-Fi, but you also get to benefit from the free wine and food.
I managed to get in for free simply because I'm a holder of a visa credit card offered by a major bank in Singapore. For those of you interested in taking advantage of the benefit, feel free to check out your local bank to see if they offer the same services.
So far, this is the only free lunch that I've found in the world that claims that there's no such thing as a free lunch. :D